Support

Here are the troubleshooting steps:

1. Check if the maintenance circuit breaker is actually closed.

2. Connect the MTR and check the dry contact settings. Is there a setting for the maintenance circuit breaker to be closed? Change it to another option. If the alarm disappears, the dry contact board is damaged.

3. Check the J3 cable on the monitoring interface board. Disconnect it. If the alarm disappears, the auxiliary contact of the maintenance circuit breaker or the corresponding signal cable is damaged. If the alarm persists, the monitoring interface board or control board is damaged.

Q:In INVT EC160A VFD, the cooling fan runs continuously after power ON. The drive is functioning normally, but the customer considers this abnormal since the fan should run only after the RUN command. What could be the issue?
A: In this condition, check the driver board—specifically the Q3 transistor. A faulty Q3 transistor can cause the cooling fan to run continuously even without a RUN command.
After replacing the defective component, the drive operates normally and the fan behavior returns to standard logic.
Normal Condition: NDZ4
Faulty Condition: 6003XY1XN04

For IVC1S/IVC1L series PLCs

The power-off data of this series of PLCs is stored in permanent storage media, eliminating the need for a backup battery, and the storage scope is set in the system block (supports M and D components). 

When "data cannot be saved due to power failure, Memory error fault" occurs 

Steps to resolve the issue:
1. Check the "Power-off Save Range" setting in the system block to confirm that the M and D components to be saved have been included in the set range without omission;
2. Re-download the program and system blocks, write test data, power off and let it stand for 3 - 5 minutes, then restart, and check if the Memory error still appears;
3. If the error persists and data cannot be saved, it indicates that the permanent storage chip inside the PLC is damaged (not a setting issue), and the PLC unit needs to be replaced; it cannot be repaired by adjusting the program.

For IVC2/IVC3/IVC5 series PLCs

PLCs in this series rely on backup batteries to save data during power outages, and battery malfunctions can directly lead to data loss and error reporting. 

Steps to resolve the issue:
1. Prioritize checking the status of backup batteries and promptly replace failed batteries (to avoid data loss and error reporting caused by battery issues);
2. Confirm that the setting of "Power-off Save Range" in the system block is correct (the two sets of settings have no conflicts and are in a union relationship), to avoid data loss caused by incorrect range settings;
3. Re-download the program and system blocks, write test data, and perform a power-off test on the save function;
4. If an error still occurs after replacing the battery and resetting, it indicates a hardware failure in the internal storage, and professional personnel should be contacted for repair or PLC replacement.

1.Check the components on the SCR and PFC boards.
2.Check if there is any change in the BUS voltage.
3.Check the actual voltage of the battery. If the voltage is fine, then check the battery detection circuit.(Battery sampling resistor on the input board)
4.Replace the control board

1. Use a multimeter or an oscilloscope to measure the analog signal value (such as voltage 0 - 10V, current 4 - 20mA) output by the given device, and compare it with the expected given value. If the given value is 5V but the measured value is only 3V, it indicates that there is a problem with the given device, and it needs to be calibrated or replaced.

2. Carefully inspect the connection lines from the given equipment to the frequency converter to check for any open circuits, short circuits or poor contacts. Damaged lines may cause signal attenuation or interference, and poor contacts will make the signal unstable, sometimes present and sometimes absent. For example, if the connection at the line joint is loose, the measured given signal will fluctuate between normal and abnormal values.

3. Enter the parameter setting interface of the frequency converter and check whether the setting of the analog input type matches the actual given signal. For example, if the given signal is a 4 - 20mA current signal, but the frequency converter is set to a 0 - 10V voltage input, it will result in incorrect processing of the given signal.

4. Check whether the upper and lower limit values corresponding to the analog quantity in the parameter settings are correct.

5. Re-calibrate the analog input channels. Taking AI1 as an example, when the input range is 4mA to 20mA corresponding to 0 to 10V, first calibrate the lower limit of AI. Input 4mA, set P05.40 = 1, wait for the immediate information to show that the analog input value of AI1 is 0%. Then calibrate the upper limit of AI. Set P05.40 = 2, input 20mA, wait for the immediate information to show that the analog input value of AI1 is 100%, and set P05.40 = 0. The analog input calibration of AI1 is completed.

6. If the adjustment is still incorrect, you can try changing to a different analog input channel or replacing the analog module.

1. Before connection, connect the SMS pins 1 and 2 with 12-24V DC power. Pin 78 is connected via RS485 communication. Connect the three devices in sequence with network cables from one end to the other, and then connect them to the COM port on the SNMP card (e.g., com-temperature-humidity-water immersion-SMS (where the Phoenix terminals 3 and 4 of the water immersion sensor should be short-circuited)).
2. Connect the SNMP card, enter the device management interface, add the application, and set different addresses (this needs to be done in conjunction with the dip switch settings)
3. Enter the serial communication settings interface and set the baud rate to 9600.
4. Finally, enter the expansion device interface to check if the communication is successful and the functions are normal.

1. On the SNMP card interface - Restore factory settings - Click to clear historical record data
2. After clearing the data, restart the SNMP card and check if the alarm has been eliminated. If not, repeat the above operation.

1. First check the fuse on the monitoring board (17001-03465) to see if it is blown. This is the most common direct cause of this fault.
2. If the fuse is normal and a spare SNMP module is available on-site, replace the SNMP module directly and observe whether the indicator returns to normal.
3. If both of the above are normal, the fault is most likely in the connection cable between the SNMP module and the monitoring board（J16）.

Preventive measures:
1. During operation, ensure the SNMP module is connected to the port marked “Network”.
Incorrect connection to the “COMM” port may cause faults such as blowing the fuse on the monitoring board.

 1. It is recommended that UPS and the battery pack are from the same manufacturer. Because the charging parameters of UPS from different manufacturers are inconsistent, if the parameters do not match, it is easy to cause battery damage..
2. If it is really necessary to use separately, the charging parameters must be clearly communicated to the customer and the parameters must be recorded and filed.
3. Install a battery temperature collector, battery over-temperature alarm, to prevent fire.